σ-1 Receptors (σ1 Binding Sites) Form Raft-Like Microdomains and Target Lipid Droplets on the Endoplasmic Reticulum: Roles in Endoplasmic Reticulum Lipid Compartmentalization and Export
Abstract
The brain sigma-1 receptors can bind neurosteroids and psychotropic drugs, including neuroleptics and cocaine and are implicated in schizophrenia, depression, and drug dependence. In this study, we found that sigma-1 receptors specifically target lipid storage sites (lipid droplets) on the endoplasmic reticulum by forming a distinct class of lipid microdomains. Both endogenously expressing sigma-1 receptors and transfected C-terminally enhanced yellow fluorescent protein (EYFP)-tagged sigma-1 receptors (Sig-1R-EYFP) target unique "ring-like" structures associated with endoplasmic reticulum reticular networks in NG108-15 cells. The ring-like structures contain neutral lipids and are enlarged by the oleate treatment, indicating that they are endoplasmic reticulum-associated lipid droplets (ER-LDs). sigma-1 receptors colocalize with caveolin-2, a cholesterol-binding protein in lipid rafts on the ER-LDs, but not with adipocyte differentiation-related protein (ADRP), a cytosolic lipid droplet (c-LD)-specific protein. When the double-arginine ER retention signal on the N terminus of sigma-1 receptors is truncated, sigma-1 receptors no longer exist on ER-LDs, but predominantly target c-LDs, which contain ADRP. sigma-1 receptors on ER-LDs form detergent-resistant raft-like lipid microdomains, the buoyancy of which is different from that of plasma membrane lipid rafts. (+)-Pentazocine causes sigma-1 receptors to disappear from the microdomains. N-Terminally EYFP-tagged sigma-1 receptors (EYFP-Sig-1R) failed to target ER-LDs. EYFP-Sig-1R-transfected cells showed an unrestricted distribution of neutral lipids all over the endoplasmic reticulum network, decreases in c-LDs and cholesterol in plasma membranes, and the bulbous aggregation of endoplasmic reticulum. Thus, sigma-1 receptors are unique endoplasmic reticulum proteins that regulate the compartmentalization of lipids on the endoplasmic reticulum and their export from the endoplasmic reticulum to plasma membrane and c-LDs.
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SIGMAR1 appears to promote compartmentalization of cholesterol in ER membranes, while depletion of cholesterol promotes mitochondrial-ER association in in vitro membrane association assays and cell models.
“Interestingly, SIGMAR1 appears to promote the compartmentalization of cholesterol in ER membranes (158), although depletion of cholesterol promoted mitochondrial–ER association in in vitro membrane association assays and cell models (159).”
From Adrenal Mitochondria and Steroidogenesis: From Individual Proteins to Functional Protein Assemblies (2016) · cites this paper as [158]
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Self-citationWilliamson, C. D., Wong, D. S., Bozidis, P., Zhang, A., & Colberg‐Poley, A. M. (2015) · Current Protocols in Cell Biology · doi:10.1002/0471143030.cb0327s68 · Cited by 92 · see citing works
The sigma1 receptor interacts with N-alkyl amines and endogenous sphingolipids
Ramachandran, S., Chu, U. B., Mavlyutov, T. A., Pal, A., Pyne, S., & Ruoho, A. E. (2009) · European Journal of Pharmacology · doi:10.1016/j.ejphar.2009.03.003 · Cited by 91 · see citing works
Hayashi, T., & Su, T. (2007) · Expert Opinion on Therapeutic Targets · doi:10.1517/14728222.12.1.45 · Cited by 91 · see citing works
Self-citationStress Responses from the Endoplasmic Reticulum in Cancer
Kato, H., & Nishitoh, H. (2015) · Frontiers in Oncology · doi:10.3389/fonc.2015.00093 · Cited by 83 · see citing works
Hayashi, T. (2015) · Psychiatry and Clinical Neurosciences · doi:10.1111/pcn.12262 · Cited by 87 · see citing works
Self-citationSigma Receptor 1 Modulates Endoplasmic Reticulum Stress in Retinal Neurons
Ha, Y., Dun, Y., Thangaraju, M., Duplantier, J., Dong, Z., Liu, K., Ganapathy, V., & Smith, S. B. (2010) · Investigative Ophthalmology & Visual Science · doi:10.1167/iovs.10-5731 · Cited by 87 · see citing works
Identification of Regions of the σ-1 Receptor Ligand Binding Site Using a Novel Photoprobe
Pal, A., Hajipour, A. R., Fontanilla, D., Ramachandran, S., Chu, U. B., Mavlyutov, T. A., & Ruoho, A. E. (2007) · Molecular Pharmacology · doi:10.1124/mol.107.038307 · Cited by 86 · see citing works
Sigma-2 receptors are specifically localized to lipid rafts in rat liver membranes
Gebreselassie, D., & Bowen, W. D. (2004) · European Journal of Pharmacology · doi:10.1016/j.ejphar.2004.04.005 · Cited by 84 · see citing works
Takebayashi, M., Hayashi, T., & Su, T. (2004) · Synapse · doi:10.1002/syn.20041 · Cited by 84 · see citing works
Self-citationHayashi, T., Justinová, Z., Hayashi, E., Cormaci, G., Mori, T., Tsai, S., Barnes, C., Goldberg, S. R., & Su, T. (2009) · Journal of Pharmacology and Experimental Therapeutics · doi:10.1124/jpet.109.159244 · Cited by 84 · see citing works
Self-citationShioda, N., Ishikawa, K., Tagashira, H., Ishizuka, T., Yawo, H., & Fukunaga, K. (2012) · Journal of Biological Chemistry · doi:10.1074/jbc.m112.349142 · Cited by 78 · see citing works
Sambo, D. O., Lebowitz, J. J., & Khoshbouei, H. (2018) · Pharmacology & Therapeutics · doi:10.1016/j.pharmthera.2018.01.009 · Cited by 75 · see citing works
Fixation and permeabilization protocol is critical for the immunolabeling of lipid droplet proteins
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Stefański, R., Justinová, Z., Hayashi, T., Takebayashi, M., Goldberg, S. R., & Su, T. (2004) · Psychopharmacology · doi:10.1007/s00213-004-1779-9 · Cited by 76 · see citing works
Self-citationSabino, V., Cottone, P., Zhao, Y., Iyer, M. R., Steardo, L., Steardo, L., Rice, K. C., Conti, B., Koob, G. F., & Zorrilla, E. P. (2008) · Neuropsychopharmacology · doi:10.1038/npp.2008.192 · Cited by 74 · see citing works
Hiranita, T., Soto, P. L., Kohut, S. J., Kopajtic, T. A., Cao, J., Newman, A. H., Tanda, G., & Katz, J. L. (2011) · Journal of Pharmacology and Experimental Therapeutics · doi:10.1124/jpet.111.185025 · Cited by 74 · see citing works
Li, X., Ye, J., Zhou, L., Gu, W., Fisher, E. A. A., & Li, P. (2012) · Journal of Lipid Research · doi:10.1194/jlr.m026591 · Cited by 74 · see citing works
Wang, J., SAUL, A. B., Roon, P., & Smith, S. B. (2016) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1521749113 · Cited by 70 · see citing works
Targeting Sigma Receptors for the Treatment of Neurodegenerative and Neurodevelopmental Disorders
Malar, D. S., Thitilertdecha, P., Ruckvongacheep, K. S., Brimson, S., Tencomnao, T., & Brimson, J. M. (2023) · CNS Drugs · doi:10.1007/s40263-023-01007-6 · Cited by 74 · see citing works
Maurice, T. (2020) · Expert Opinion on Drug Discovery · doi:10.1080/17460441.2021.1838483 · Cited by 70 · see citing works
Revisiting the sigma-1 receptor as a biological target to treat affective and cognitive disorders
Sałaciak, K., & Pytka, K. (2021) · Neuroscience & Biobehavioral Reviews · doi:10.1016/j.neubiorev.2021.10.037 · Cited by 71 · see citing works
A Role for Sigma Receptors in Stimulant Self Administration and Addiction
Katz, J. L., Su, T., Hiranita, T., Hayashi, T., Tanda, G., Kopajtic, T. A., & Tsai, S. (2011) · Pharmaceuticals · doi:10.3390/ph4060880 · Cited by 71 · see citing works
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Fallica, A. N., Pittalà, V., Modica, M. N., Salerno, L., Romeo, G., Marrazzo, A., Helal, M. A., & Intagliata, S. (2021) · Journal of Medicinal Chemistry · doi:10.1021/acs.jmedchem.0c02265 · Cited by 69 · see citing works
Mitochondrial lipid transport at a glance
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The role of sigma 1 receptor in organization of endoplasmic reticulum signaling microdomains
Zhemkov, V., Ditlev, J. A., Lee, W.-R., Wilson, M., Liou, J., Rosen, M. K., & Борисович, Б. И. (2021) · eLife · doi:10.7554/elife.65192 · Cited by 66 · see citing works
Demonstration of a Direct Interaction between σ-1 Receptors and Acid-Sensing Ion Channels
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Accelerated retinal ganglion cell death in mice deficient in the Sigma-1 receptor.
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Elements in support of the ‘non-identity’ of the PGRMC1 protein with the σ2 receptor
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Hayashi, T., & Su, T. (2010) · Sub-cellular biochemistry/Subcellular biochemistry · doi:10.1007/978-90-481-8622-8_13 · Cited by 66 · see citing works
Self-citationSigma 1 receptor: A novel therapeutic target in retinal disease
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Cocaine promotes oxidative stress and microglial-macrophage activation in rat cerebellum
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The role of sigma-1 receptors in the pathophysiology of neuropsychiatric diseases
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Molecular Interplay Between the Sigma-1 Receptor, Steroids, and Ion Channels
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Sigma-1 (σ1) Receptor in Memory and Neurodegenerative Diseases
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Role of mitochondrial raft-like microdomains in the regulation of cell apoptosis
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- Authors
- Hayashi, T., & Su, T.-P.
- Affiliations
- National Institutes of Health (US)
- ORCID
- Su, Tsung-Ping
- Venue
- The Journal of Pharmacology and Experimental Therapeutics
- Publisher
- Elsevier BV
- Published
- 2003-08
- Volume
- 306
- Issue
- 2
- Pages
- 718-725
- ISSN
- 0022-3565 (ISSN-L)
- OpenAlex
- W2156975935
- Cited by
- 262
- References
- 41
- Citations by year
- 2026: 5 · 2025: 10 · 2024: 6 · 2023: 14 · 2022: 5 · 2021: 25 · 2020: 13 · 2019: 9 · 2018: 6 · 2017: 13 · 2016: 12 · 2015: 12 · 2014: 18 · 2013: 11 · 2012: 12
- FWCI
- 3.34
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pharmacological Receptor Mechanisms and Effects
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Caveolin-1 and cellular processes
- Keywords
- sigma-1 receptor, lipid rafts, lipid droplets, endoplasmic reticulum, caveolin-2, ADRP, pentazocine, neutral lipids, cholesterol, neurosteroids, NG108-15 cells
- MeSH terms
- Sigma-1 Receptor, Animals, Bacterial Proteins, Binding Sites, Endoplasmic Reticulum, Guinea Pigs, Hybridomas, Intracellular Membranes, Luminescent Proteins, Tumor Cells, Cultured, Protein Structure, Tertiary, Receptors, sigma, Mice, Rats
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